LTC3400-1 Datasheet, PDF (1/12 Pages) Linear Technology – 600mA, 1.2MHz Micropower Synchronous Boost Converter in ThinSOT

LTC3400-1
600mA, 1.2MHz Micropower
Synchronous Boost Converter
in ThinSOT
FEATURES
■ _{Up to 92% Efficiency}
■ _{Generates 3.3V at 100mA from a Single AA Cell}
■ _{Low Start-Up Voltage: 0.85V}
■ _{VOUT Connected to VIN in Shutdown}
■ _{Internal Synchronous Rectifier}
■ _{2.5V to 5V Output Range}
■ _{Automatic Burst Mode}^® _Operation
■ _{Logic Controlled Shutdown (< 1µA)}
■ _{Antiringing Control Minimizes EMI}
■ _{Tiny External Components}
■ _{Low Profile (1mm) SOT-23 Package}
U
APPLICATIO S
■ _Pagers
■ _{MP3 Players}
■ _{Digital Cameras}
■ _{LCD Bias Supplies}
■ _{Handheld Instruments}
■ _{Wireless Handsets}
■ _{GPS Receivers}
DESCRIPTIO
The LTC^®3400-1 is a synchronous, fixed frequency, step-
up DC/DC converter delivering high efficiency in a 6-lead
ThinSOT™ package. Capable of supplying 3.3V at 100mA
from a single AA cell input, the device contains an internal
NMOS switch and PMOS synchronous rectifier.
A switching frequency of 1.2MHz minimizes solution
footprint by allowing the use of tiny, low profile inductors
and ceramic capacitors. The current mode PWM design is
internally compensated, reducing external parts count.
The LTC3400-1 features automatic shifting to power sav-
ing Burst Mode operation at light loads. In shutdown, V_OUT
and V_IN are connected, which allows the input battery to be
used for backup power. The LTC3400-1 features low
shutdown current of under 1µA.
The LTC3400-1 is offered in the low profile (1mm)
SOT-23 package.
, LTC, LT and Burst Mode are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
US Patent Numbers 5,481,178; 6,580,258; 6,304,066; 6,127,815; 6,498,466; 6,611,131.
TYPICAL APPLICATIO
Single Cell to 3.3V Synchronous Boost Converter
+ _SINGLE
AA CELL
4.7µH
4.7µF
OFF ON
SW
V_IN V_OUT
LTC3400-1
SHDN FB
GND
1.02M
1%
604k
1%
V_OUT
3.3V
100mA
4.7µF
34001 F01
Efficiency
100
90
V_IN = 2.4V
80
V_IN = 1.5V
70
60
50
FIGURE 1 CIRCUIT
WITH OPTIONAL SCHOTTKY DIODE
(SEE APPLICATIONS INFORMATION)
40
0.1
1
10
100
LOAD CURRENT (mA)
1000
34001 F01a
34001f
1